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A unit of frequency equal to 1,000,000 hertz.
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The band of frequencies from 300 kHz to 3 MHZ.
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That part of the radiated signal of a quarter-wave antenna (Marconi antenna) appearing to come from an underground image of the real antenna. This image is also called ground reflection.
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The wave that results after the information from the modulating signal is impressed onto the carrier signal. The wave that is transmitted.
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The process of adding, or superimposing, information on an RF carrier wave.
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The highest operating frequency that can be used at a specific time for successful radio communications between two points,
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An antenna that radiates or receives equally well in all directions, except directly off the ends.
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An electrical circuit that generates alternating current at a particular frequency.
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An antenna that radiates its signal back into a large reflecting surface (called the disk) for radiation.
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The time required to complete one cycle of a waveform.
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The plane (horizontal or vertical) of the electric field as radiated from a transmitting antenna.
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Electromagnetic radiation hazard generated from electronic equipment.
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The electromagnetic field that radiates from an antenna and travels through space.
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The resistance that, if inserted in place of an antenna, would consume the same amount of power that is radiated by the antenna.
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Plain text or unencrypted information.
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An electromagnetic wave that travels back toward the transmitter from the antenna because of mismatch in impedance between the two.
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Occurs when a radio wave strikes the Earth?s surface at some distance from the transmitting antenna and is returned upward toward the atmosphere.
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A frequency in the range within which radio waves can be transmitted. Frequencies used for radio communication fall between 3 kHz and 300 Ghz.
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Radio frequency energy. Energy produced at the output of a transmitter.
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A type of worldwide, reliable, high-capacity, secure, and cost-effective telecommunications system using satellites.
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The band of frequencies from 3 Ghz to 30 Ghz.
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Detectable transmitted energy that can be used to carry information.
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The stationary waves that build up along an antenna during radiation.
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Device that connects receiver outputs to numerous pieces of equipment.